| 摘要 |
PURPOSE:To eliminate the need for control of the output frequency and at the same time to avoid a change with time as well as to improve the reliability for a mixer circuit, by applying the mixer output generated to a resistance element provided at a mixer output part to a solid state resonator via a buffer circuit. CONSTITUTION:The 1st input signal of a frequency f1 is applied between input terminals 18a and 18b of a main circuit part 2, and at the same time the 2nd input signal of a frequency f2 is applied to an input terminal 28 of the other side. As a result, the active current of a differential amplifier 8 is excited with the frequency f2, and differential amplifiers 4 and 6 work in response to the frequency f1. Then the output of the frequency components f1, f2, f1+f2 and f1-f2 are extracted from a resistance 32 which is connected between the collectors of transistors 12 and 16 of amplifiers 4 and 6 respectively and a power supply line. This output is applied to a buffer circuit 36 to perform the impedance adjustment. Thus the output V0 of the desired frequency component is extracted from an output terminal 42 via a solid state resonator 40. |
